When you're fucking a chick in the ass and right before you cum she looks back at you with fangled ass teeth. You then realize that this is no chick, but a man! After completion, the man continues to call you non-stop, asking ridiculously long questions.

Guy #1: Yo dude, I was fucking this chick last night!
Guy #2: Oh, Yea?
Guy #1: Yea, turns out it was Carmichael Dave. Now I'm going over on my anytime minutes...